stirling.pdf

Stirling Engine

Prof. S. L. Bapat

Mechanical Engineering Department

Department of Energy Science and Engineering

Indian Institute of Technology Bombay,

Mumbai – 400 076

April 28, 2008

Indian Scenario

• Shortage of Electrical Power

Thermal power plants

Nuclear power plants

Hydel power plants

• Solar P-V cells

• Solar Thermal

Rankine Cycle

Stirling Cycle

Choice of Capacity for Stirling Engine

• ~ 43,000 villages to be electrified

• Features of these villages (Sastry, 2003):

– Difficult terrain

– 3-30 km away from grid

– No. of household 2 to 200

– Average population ~ 500

– Power demand quite low (Supply for 4-6 hrs/day)

– facilities are minimal (TV, Refrigerators etc.)

– Income levels & paying capacity low

Cost of P-V plants ranges from Rs. 3.6 lakh- 4.8 lakh for 1.5 kW

(Sastry, 2003)

Applications:

- For a group of 3-4 households having enough cattle to

supply bio-gas for gas based systems or hybrid systems

- Use for small capacity pumps for irrigation application

Investment

Rs.

required (in 2003)

per village

60,000

24,00,000

for India

1.20 billion

48 billion

( Normally explained by using α – type)

• Assumptions

• Working

– Compress the gas, heat the gas, and

then expand to get power output

– Internal heat transfer in regenerator

(a) P-V and T-S diagrams (b) Piston arrangements at the terminal

points of the cycle (c) Displacement-time diagram

Ideal Stirling cycle

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